Diode, directly heated
![Diode, directly heated, tube diode,](https://conceptdraw.com/a2093c3/p1/preview/256/pict--diode,-directly-heated-electron-tubes-vector-stencils-library)
Diode, indirectly heated
![Diode, indirectly heated, tube diode,](https://conceptdraw.com/a2093c3/p2/preview/256/pict--diode,-indirectly-heated-electron-tubes-vector-stencils-library)
Diode, envelope, direct. heated
![Diode, envelope, direct. heated, tube diode,](https://conceptdraw.com/a2093c3/p3/preview/256/pict--diode,-envelope,-direct.-heated-electron-tubes-vector-stencils-library)
Diode, envelope, indirect. heated
![Diode, envelope, indirect. heated, tube diode,](https://conceptdraw.com/a2093c3/p4/preview/256/pict--diode,-envelope,-indirect.-heated-electron-tubes-vector-stencils-library)
Triode, directly heated
![Triode, directly heated, tube triode,](https://conceptdraw.com/a2093c3/p5/preview/256/pict--triode,-directly-heated-electron-tubes-vector-stencils-library)
Triode, indirectly heated
![Triode, indirectly heated, tube triode,](https://conceptdraw.com/a2093c3/p6/preview/256/pict--triode,-indirectly-heated-electron-tubes-vector-stencils-library)
Triode, envelope, direct. heated
![Triode, envelope, direct. heated, tube triode,](https://conceptdraw.com/a2093c3/p7/preview/256/pict--triode,-envelope,-direct.-heated-electron-tubes-vector-stencils-library)
Triode, envelope, indirect. heated
![Triode, envelope, indirect. heated, tube triode,](https://conceptdraw.com/a2093c3/p8/preview/256/pict--triode,-envelope,-indirect.-heated-electron-tubes-vector-stencils-library)
Tetrode, directly heated
![Tetrode, directly heated, tube tetrode,](https://conceptdraw.com/a2093c3/p9/preview/256/pict--tetrode,-directly-heated-electron-tubes-vector-stencils-library)
Tetrode, indirectly heated
![Tetrode, indirectly heated, tube tetrode,](https://conceptdraw.com/a2093c3/p10/preview/256/pict--tetrode,-indirectly-heated-electron-tubes-vector-stencils-library)
Tetrode, envelope, direct. heated
![Tetrode, envelope, direct. heated, tube tetrode,](https://conceptdraw.com/a2093c3/p11/preview/256/pict--tetrode,-envelope,-direct.-heated-electron-tubes-vector-stencils-library)
Tetrode, envelope, indirect. heated
![Tetrode, envelope, indirect. heated, tube tetrode,](https://conceptdraw.com/a2093c3/p12/preview/256/pict--tetrode,-envelope,-indirect.-heated-electron-tubes-vector-stencils-library)
Pentode, directly heated
![Pentode, directly heated, tube pentode,](https://conceptdraw.com/a2093c3/p13/preview/256/pict--pentode,-directly-heated-electron-tubes-vector-stencils-library)
Pentode, indirectly heated, external connection
![Pentode, indirectly heated, external connection, tube pentode,](https://conceptdraw.com/a2093c3/p14/preview/256/pict--pentode,-indirectly-heated,-external-connection-electron-tubes-vector-stencils-library)
Pentode, indirectly heated, internal connection
![Pentode, indirectly heated, internal connection, tube pentode,](https://conceptdraw.com/a2093c3/p15/preview/256/pict--pentode,-indirectly-heated,-internal-connection-electron-tubes-vector-stencils-library)
Pentode, envelope, direct. heated
![Pentode, envelope, direct. heated, tube pentode,](https://conceptdraw.com/a2093c3/p16/preview/256/pict--pentode,-envelope,-direct.-heated-electron-tubes-vector-stencils-library)
Pentode, envelope, indirect. heated, external connection
![Pentode, envelope, indirect. heated, external connection, tube pentode,](https://conceptdraw.com/a2093c3/p17/preview/256/pict--pentode,-envelope,-indirect.-heated,-external-connection-electron-tubes-vector-stencils-library)
Pentode, envelope, indirect. heated, internal connection
![Pentode, envelope, indirect. heated, internal connection, tube pentode,](https://conceptdraw.com/a2093c3/p18/preview/256/pict--pentode,-envelope,-indirect.-heated,-internal-connection-electron-tubes-vector-stencils-library)
Diode, directly heated 2
![Diode, directly heated 2, tube diode,](https://conceptdraw.com/a2093c3/p19/preview/256/pict--diode,-directly-heated-2-electron-tubes-vector-stencils-library)
Diode, indirectly heated 2
![Diode, indirectly heated 2, tube diode,](https://conceptdraw.com/a2093c3/p20/preview/256/pict--diode,-indirectly-heated-2-electron-tubes-vector-stencils-library)
Diode, envelope, direct. heated 2
![Diode, envelope, direct. heated 2, tube diode,](https://conceptdraw.com/a2093c3/p21/preview/256/pict--diode,-envelope,-direct.-heated-2-electron-tubes-vector-stencils-library)
Diode, envelope, indirect. heated 2
![Diode, envelope, indirect. heated 2, tube diode,](https://conceptdraw.com/a2093c3/p22/preview/256/pict--diode,-envelope,-indirect.-heated-2-electron-tubes-vector-stencils-library)
Triode, directly heated 2
![Triode, directly heated 2, tube triode,](https://conceptdraw.com/a2093c3/p23/preview/256/pict--triode,-directly-heated-2-electron-tubes-vector-stencils-library)
Triode, indirectly heated 2
![Triode, indirectly heated 2, tube triode,](https://conceptdraw.com/a2093c3/p24/preview/256/pict--triode,-indirectly-heated-2-electron-tubes-vector-stencils-library)
Triode, envelope, direct. heated 2
![Triode, envelope, direct. heated 2, tube triode,](https://conceptdraw.com/a2093c3/p25/preview/256/pict--triode,-envelope,-direct.-heated-2-electron-tubes-vector-stencils-library)
Triode, envelope, indirect. heated 2
![Triode, envelope, indirect. heated 2, tube triode,](https://conceptdraw.com/a2093c3/p26/preview/256/pict--triode,-envelope,-indirect.-heated-2-electron-tubes-vector-stencils-library)
Tetrode, directly heated 2
![Tetrode, directly heated 2, tube tetrode,](https://conceptdraw.com/a2093c3/p27/preview/256/pict--tetrode,-directly-heated-2-electron-tubes-vector-stencils-library)
Tetrode, indirectly heated 2
![Tetrode, indirectly heated 2, tube tetrode,](https://conceptdraw.com/a2093c3/p28/preview/256/pict--tetrode,-indirectly-heated-2-electron-tubes-vector-stencils-library)
Tetrode, envelope, direct. heated 2
![Tetrode, envelope, direct. heated 2, tube tetrode,](https://conceptdraw.com/a2093c3/p29/preview/256/pict--tetrode,-envelope,-direct.-heated-2-electron-tubes-vector-stencils-library)
Tetrode, envelope, indirect. heated 2
![Tetrode, envelope, indirect. heated 2, tube tetrode,](https://conceptdraw.com/a2093c3/p30/preview/256/pict--tetrode,-envelope,-indirect.-heated-2-electron-tubes-vector-stencils-library)
Pentode, directly heated 2
![Pentode, directly heated 2, tube pentode,](https://conceptdraw.com/a2093c3/p31/preview/256/pict--pentode,-directly-heated-2-electron-tubes-vector-stencils-library)
Pentode, indirectly heated, external connection 2
![Pentode, indirectly heated, external connection 2, tube pentode,](https://conceptdraw.com/a2093c3/p32/preview/256/pict--pentode,-indirectly-heated,-external-connection-2-electron-tubes-vector-stencils-library)
Pentode, indirectly heated, internal connection 2
![Pentode, indirectly heated, internal connection 2, tube pentode,](https://conceptdraw.com/a2093c3/p33/preview/256/pict--pentode,-indirectly-heated,-internal-connection-2-electron-tubes-vector-stencils-library)
Pentode, envelope, direct. heated 2
![Pentode, envelope, direct. heated 2, tube pentode,](https://conceptdraw.com/a2093c3/p34/preview/256/pict--pentode,-envelope,-direct.-heated-2-electron-tubes-vector-stencils-library)
Pentode, envelope, indirect. heated, external connection 2
![Pentode, envelope, indirect. heated, external connection 2, tube pentode,](https://conceptdraw.com/a2093c3/p35/preview/256/pict--pentode,-envelope,-indirect.-heated,-external-connection-2-electron-tubes-vector-stencils-library)
Pentode, envelope, indirect. heated, internal connection 2
![Pentode, envelope, indirect. heated, internal connection 2, tube pentode,](https://conceptdraw.com/a2093c3/p36/preview/256/pict--pentode,-envelope,-indirect.-heated,-internal-connection-2-electron-tubes-vector-stencils-library)